"Iran's Warning to Russia Preceded Moscow Attack, Ukraine's Intelligence Chief Reveals"

Iran alerted Russia to a possible terrorist attack on its soil before the deadly concert hall massacre near Moscow, sharing information gained from suspects linked to a previous attack in Iran. The United States also warned Russia of a likely militant Islamist attack, with both countries pointing to ISIS-K as the perpetrator. The attacks in Iran and near Moscow involved Tajik nationals, and Iran discussed its security concerns with Tajikistan, as ISIS-K has aggressively recruited from the impoverished former Soviet republic.